EF XR diffs also have the lower watts linkage mounting point. This was then carried on to all EL diffs.

Yes, you will need the EF upper control arms.

Ideally, sourcing an EL diff would be the preferred option as the upper control arm brackets have better mounting options when lowering your car. Of course if you lower your car you will need the XR upper control arms which are unique to the EL XRs.

There is nothing wrong with using the EF XR diff. I have one in my EB and it is great.

There's nothing too difficult to do. As Krytox said use the EF upper arms to start with.
The Watts link arms should be fine, your Futura should have the lower locating pin position on the diff rear cover plate [my 98 EL Futura has].
You should be able to transfer that cover to the EF housing if necessary. If it's a late EF diff it may already have the Watts pin in the lower position on the rear cover.
It's that lower pin position that tightened up the EL rear end somewhat.
There are some slight differences with the rear handbrake cable mountings on the diff. housing but if if you get the EF one with the purchase you can choose which one you'll use.
BenJ fitted an EF XR6 diff to his EB2 and we put an ELXR6 diff assembly on my EB2, complete with EL handbrake setup. No real problems just matching the upper arms for the correct diff pinion angle on the lowered cars.
If we could muddle through that, you should breeze through fitting an EF diff to an EL. LOL
Cheers,
Paul

ok thx for the replys, my car has already been lowered so all i will need is the EF XR upper arms and the handbrake assembly? And i can swap the cover off my EL Diff to EF and that should fix the watts link arm position

Me EF diff had small metal brackets bolted to the top of the diff centre for the EF handbrake, but I believe the EL handbrake cable is routed through a casting on the diff hat itself. This casting is there on my EF XR diff.

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